Wesley learn that 3/10 of the students in his class or left-handed write 3/10 as a fraction with a denominator of 100 and as a decimal

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?

Can someone me out here number 4 plz

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?